Downdraft hot-air furnace



fatented July '15, i952 Um STATES PATENT OFFI DOWNDRAF'I' HOT-AIR FURNACE John Horace Beauchamp, Houston, Tex. Application November 5, 1948, Serial No. 58,477

My invention relates to furnaces, and more particularly to furnaces for heating air or fluid.

An object of my invention is to'provide an improved furnace which includes a vertically-dis.- posed tortuous flue for the products of combustion, the heating chamber operatively connected to the upper end of the flue, and means operatively associated with the flue for drawingthe products of combustion downwardly through the flue and discharging the same from the lowerend thereof.

A further object is to provide an improved furnace such as thatlast described, which includes means for separating condensate from the gaseous products of combustion. a j. 7

Other objects and advantages reside in the particular structure of the invention, combination and arrangement of the several parts there-' of, and will .be readily understood by those skilled in the art upon reference to the attached draw ings in connection with the following specification, wherein the invention is shown,-described and claimed.

In the drawings; V

Figure 1 is a longitudinal vertical sectional view through the furnace according to the invention; 7 j s Figure 2 is a transverse vertical sectionalview taken substantially on the plane of the line 2-2 of Figure 1;

Figure 3 is a horizontal sectional view taken substantially on the plane of the line 3-3 of Figure 2;

Figure 4 is an enlarged fragmentary vertical sectional view taken substantially on the plane of the line 4-4 of Figure 1.

Referring specifically to the drawings, wherein like reference characters have been used throughout the several views to designate like parts. the form of furnace illustrated herein by way of an example comprises a housing I of any suitable material, but which preferably includes outer and inner walls II and I2, respectively, providing an airspace l3 therebetweena; The housing I0 may be partially closed at the top by a top wall I4. That portion of the top wall It overlying the interior chamber I5 defined by the inner walls I2 is perforated, as at l6, for the passage of heated air upwardlyv out of the furnace. A cold air'intakel'lopens through the walls II and I2 adjacent the lower edges thereof. The housing It may be closed at the bottom by a single bottom wall or floor [8, and the furnace itself is adapted to rest upon the floor I9 of a room or the like. Suitable access doors 2| and 22 1 can (01. 126- 116) z may be provided as necessary in the outer wall I2 of the housing. Also, an opening 23.may be formed in a lower portionof the outer wall ,Il-

forthe entrance of air for supporting combustion .in a combustion. chamber now to rbeidescribed. v ,1'31'1:

In the. embodiment illustrated,,there has been provided a pair of combustion chambers 24,,but it is to be understood that but a single combustion chamber can be used, or that more than two coin bustion chambers may be used, if desired, As the combustion chambers 24 --are substantially identical, it will suffice to describe butasingle one of them. Thus, each combustion chamber 24 comprises a tubular body extending longitudinally of the housing I0 and supported at each end by opposite inner walls I2,- The frontends 25 of the chambers 24 open into'thespac .13 between the walls II and I2. An elongated gaseous fuel burner 26 extends longitudinally oi each combustion chamber '24 interiorly thereof. Each burner 26 includes a plurality of upwardly: directed gas jets :21. The burner 26 in the region of the front end 25 of the combustion chamber is provided. with laterally-directed apertures 28, Figure 1. An -apertured sleeve 29 encirclslaburner 26 in the region of the apertures 28'where-.

by to control the mixture of air supplied .to'the The rear end 32 of each combustion charxiberj 24 opens into a" vertically-disposed; flue 33 which is'ofzigzag configuration to provide a'tortuous' flue. The lowerends of the fines 33 arefconnected together by anysuitable header 34 which in turn opens into a downwardly-directed 00h duit' 35 A laterally-directed conduit. 38 opens into the downwardly-directed conduit 35 inter mediate the ends of theflatter; The-conduit 3t is connected to theintake-' side of an suitable, suction-generating device, such as the'blower 3 I which may be driven in any suitable 'mannergasf by the electric motor 38.; The outlet port '39 fori the blower 31 discharges into any'suitable' s'taci or exhaust conduit 40 which leads from the housing I0 through an opening 4| formed in the floor l8 thereof and the floor I9 of the room. The 

